WO2000064989A1

WO2000064989A1 - Cyanine dye

Info

Publication number: WO2000064989A1
Application number: PCT/JP2000/002740
Authority: WO
Inventors: Ayako Hohsaka; Toshio Kawata; Shigeo Yasui
Original assignee: Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo
Priority date: 1999-04-27
Filing date: 2000-04-26
Publication date: 2000-11-02
Also published as: TWI254733B; KR20000071791A; EP1092753A1; JP3232512B2; JP2001011329A

Abstract

An organic dye compound which is useful in optical recording media, contains a fluorine-containing anion as a counter ion, and has excellent solubility. The compound is an indolenine-based pentamethine cyanine dye having a specific structure. Also provided are: a light-absorbing material and an optical recording medium each containing the cyanine dye; and a process for producing the cyanine dye via the step of reacting a compound having a 3,3-dimethyl-2-(1,3-butadienyl)-3H-benzoindolenium skeleton with a compound having a 2,3,3-trimethyl-3H-benzoindolenium skeleton.

Description

Description Cyanine dye Technical field

The present invention relates to a cyanine dye useful as a light absorbing material, and in particular, to a novel indrenine-based pentamethine cyanine dye useful in an optical recording medium. Background art

With the advent of the multimedia age, optical recording media such as CD-R (write-once memory using compact disc) and DVD-R (write-once memory using digital video disc) are in the spotlight. . The optical recording medium is composed of an inorganic perforated optical recording medium that forms the recording layer using inorganic substances such as tellurium, selenium, rhodium, carbon, and hydrogen sulfide, and a light absorbing material mainly composed of an organic dye compound. It can be broadly divided into the organic perforated optical recording media that make up.

Of these, the organic perforated optical recording medium usually dissolves a cyanine dye in an organic solvent such as 2,2,3,3-tetrafluoro-1-propanol (hereinafter abbreviated as “TFP”). Is applied to a polycarbonate substrate. After drying to form a recording layer, a reflective layer made of a metal such as gold, silver, and copper and a protective layer made of an ultraviolet-curable resin are sequentially adhered to form a recording layer. Produced. Organic perforated optical recording media have the disadvantage that the recording layer is more susceptible to environmental light, such as reading light or natural light, than inorganic perforated optical recording media, but the light absorbing material is applied directly to the substrate in a solution. The advantage of this is that the optical recording medium can be manufactured at low cost because the recording layer can be formed by performing the method. There is. In addition, since the organic perforated optical recording medium is mainly composed of organic substances, it has an advantage that it is not easily corroded even in an environment exposed to moisture or seawater, and is a kind of organic perforated optical recording medium. With the advent of heat-deformable optical recording media, information recorded on optical recording media can now be read using compact disk readers, and is now becoming the mainstream of inexpensive optical recording media. is there.

Urgent issues of organic perforated optical recording media are described, for example, by Masahiro Shinkai et al. In “Dyes and Chemicals”, Vol. 41, No. 5, pp. 124-134 (1996). As described above, an object of the present invention is to develop a cyanine dye having excellent solubility in an organic solvent in order to efficiently and efficiently produce an optical recording medium having good characteristics and quality. In the current standard of CD-R, pentamethine cyanine is used as a cyanine dye, in which the linking group for forming carbocyanine is composed of five methine groups because of the combination with the laser beam used for writing information. Nin dyes are desired. As a counter ion, conventional cyanine dyes that use perchlorate ion as a counter ion are easy to explode and difficult to handle. Recently, a safe cyanine dye having excellent thermal stability and using a fluorine-containing anion such as hexafluorophosphate ion as a counter ion has been desired. However, pentamethine cyanine dyes having a fluorine-containing anion as a counter ion have been proposed in, for example, Japanese Patent Nos. 2,594,443 and Japanese Patent Application Laid-Open No. 3-975856. And pentamethine cyanine dyes whose counter ion is a fluorine-containing anion because of their poor solubility in organic solvents that are widely used in the production of optical recording media, especially organic solvents with a high evaporation rate. It is difficult to increase the efficiency of forming a recording layer by dissolving the solution in such a solvent and spin-coating the solution onto the substrate of the optical recording medium, or to manufacture an optical recording medium with good characteristics and quality with good yield. Was. Disclosure of the invention

In view of such a situation, an object of the present invention is to provide an organic colorant compound which is useful in an optical recording medium such as CD-R and has excellent solubility using a fluorine-containing anion as a counter ion.

In order to solve this problem, the inventors of the present invention have conducted intensive research and searched, and found that a compound having a 3,3-dimethyl-2- (1,3-butadienyl) -13H-benzoin-drendium skeleton has a small number of compounds. A specific indrenine-based pentamethine cyanine dye having a fluorine-containing anion as a counter ion, which can be obtained via a process of reacting a compound having a, 3—trimethyl-3H—benzodinrenium skeleton, Since the compound has an absorption maximum in the visible region, it has been found that the compound has a wide variety of uses in various fields where an organic compound that absorbs visible light is required. Among such cyanine dyes, those that substantially absorb laser light having a wavelength of around 780 nm in a thin film state and have high solubility in organic solvents such as TFP are those of optical properties such as CD-R. It has been found that it is extremely useful as a light absorbing material constituting a recording layer of a recording medium. The present invention is based on the creation of a novel organic dye compound and the discovery of its industrially useful properties. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a visible absorption spectrum of a cyanine dye according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention solves the above problems by providing an indrenine-based pentamethine cyanine dye represented by the general formula 1. General formula 1:

—In the general formula 1, R 1 represents a methyl group or an ethyl group, and R ₂ represents a linear or branched alkyl group different from R 1. R ₃ represents a hydrogen atom or a substituent selected from a halogen group and a lower alkyl group. X— represents an anion containing fluorine and a metal element belonging to Group 15 of the periodic table.

R ₂ and R ₃ will be described more specifically. R ₂ usually has up to 12 carbon atoms, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isopropyl group, sec —butyl, tert —butyl, pentyl, isopentyl, neopentyl, tert-pentyl, 1 —methylpentyl, 2 —methylpentyl, hexyl, isohexyl, 5 —methyl Examples include a hexyl group, an octyl group and a dodecyl group. However, R ₂ is selected from alkyl groups other than methyl group when R, is a methyl group, and is selected from alkyl groups other than ethyl group when R, is an ethyl group. You. R ₃ is a hydrogen atom, or has a halogen group such as a chloro group, a chloro group, a bromo group, an iodo group and a straight or branched chain having up to 6 carbon atoms, for example, a methyl group, an ethyl group Groups, lower alkyl groups such as propyl groups and isopropyl groups.

X is not particularly limited as long as it is an anion containing fluorine and a metal element belonging to Group 15 of the periodic table. In short, the light absorption characteristics and solubility in organic solvents, etc., depend on the application. If we make the index appropriate Good. When used as an optical recording medium, the reflection layer containing metal is hardly altered, and contains fluorine and phosphorus or antimony. For example, hexafluorophosphoric acid, antimony hexafluoride and the like are preferable. is there.

The cyanine dye of the present invention can be produced by various methods. However, if the emphasis is placed on cost, 3,3-dimethyl-2_ (1,3_butadienyl) —3H-benzoin rhenium It is advantageous to use a method of reacting a compound having a skeleton with a compound having a 2,3,3-trimethyl-3H-benzoindolenium skeleton. According to this method, for example, a compound represented by general formula 3 having R ₂ corresponding to general formula 1 is added to a compound represented by general formula 2 having R ₃ and R ₃ corresponding to general formula 1 Or a compound represented by general formula 4 having R ₂ corresponding to general formula 1 is reacted with a compound represented by general formula 5 having R ₂ and R ₃ corresponding to general formula 1 As a result, the cyanine dye of the present invention is produced in good yield.

-General formula 2:

General formula 3:

H ₃ C CH ₃ -General formula 4:

-General formula 5:

That is, an appropriate amount (usually equimolar) of each of the compounds represented by the general formulas 2 and 3 or the compounds represented by the general formulas 4 and 5 is placed in a reaction vessel, and acetic acid and anhydride are used. Acetic acid, acetic anhydride, methanol, ethanol, propanol, isopropanol, cresol, benzyl alcohol, methyl sorb, ethyl sorb, acetone, acetonitrile, 1,4-dioxane, Solvents such as tetrahydrofuran, tetrahydropyran, formamide, N—methylformamide, N, N—dimethylformamide, N—methylpyrrolidone, dimethylsulfoxide, water, or a mixture thereof Dissolved in water, and if necessary, potassium acetate, sodium acetate, calcium carbonate, calcium carbonate, triethylamine, N, N After adding a basic compound such as dimethylaniline, piperidine, morpholine, pyridine, 1,8-diazabicyclo [54.0] -17-ndecene, the mixture is heated to 0.5 to 0.5 with stirring. Incubate for 5 hours. Then, if necessary, the reaction mixture is subjected to a normal counterion exchange reaction to obtain a specific reaction. The cyanine dye of the present invention having a fluorine-containing anion as a counter ion is obtained. Any of the cyanine dyes represented by the following chemical formulas 1 to 12 can be produced in a desired amount by this method.

In the general formulas 2 to 5, X, — and X ₂ — represent an appropriate counter ion that is the same as or different from X — in the general formula 1, and each counter ion is hexafluoride. Inorganic acids such as phosphate, halogen, potassium, perchlorate, periodate, antimony hexafluoride, stannate hexafluoride, borofluoride, tetrafluoroborate, etc. Ion, thiocyanate ion, benzenesulfonate ion, naphthalenesulfonate ion, P-toluenesulfonate ion, alkylsulfonate ion, benzene force rubonate ion, alkylcarboxylate ion, trihaloalkylcarbonate ion, alkyl Organic acid ions such as sulfate ion, trihaloalkyl sulfate ion, and nicotinate ion. When one or both of X and X _2- are not a predetermined fluorine-containing anion, as described above, after completion of the reaction, counterion exchange is performed according to a conventional method. Through the general formulas 2 to 5, each is a suitable leaving group, usually an anilino group, a P—toluidino group, a P—methoxyanilino group, a P—ethoxycarbonylanilino group, an N— A monovalent group of an aniline or an aniline derivative such as an acetyl anilino group is employed. Incidentally, the compounds represented by the general formulas 2 to 5 can be prepared, for example, by the method described in Japanese Patent Application Laid-Open No. 10-316655 by the same applicant.

Specific examples of the cyanine dye according to the present invention include, for example, compounds represented by Chemical Formulas 1 to 12. Each of these has an absorption maximum in the visible region, and most of them substantially absorb one laser beam having a wavelength of around 780 nm in a thin film state. In addition, these cyanine dyes are frequently used in the production of optical recording media, for example, in organic solvents such as TFP. Because of its high solubility in light, it uses a laser beam with a wavelength of around 780 nm as writing light, and is extremely useful as a material for forming the recording layer of optical recording media such as CD-R. It is.

Formula 1:

Formula 2:

Formula 3:

Formula 4:

Formula 5:

Formula 6:

Formula 7:

Formula 8:

Chemical formula 9:

Formula 10:

Chemical formula 12:

The cyanine dye of the present invention thus obtained may be used as a reaction mixture depending on the application.However, usually, prior to use, for example, dissolution, extraction, separation, gradient, precipitation, filtration, Purified by general-purpose methods for purifying related compounds such as concentration, thin-layer chromatography, column chromatography, gas chromatography, high-performance liquid chromatography, distillation, crystallization, and sublimation. The purification methods are applied in combination. When the cyanine dye of the present invention is used as a light absorbing material in an optical recording medium such as CD-R, it is purified by a method such as distillation, crystallization, and sublimation before use. It is desirable.

The light-absorbing material of the present invention includes one or more of such cyanine dyes, and encompasses all light-absorbing materials utilizing the property that those cyanine dyes substantially absorb visible light. The composition and physical form of the light absorbing material are not limited. Therefore, even if the light-absorbing material of the present invention is composed of the cyanine dye represented by the general formula 1, one or more other components depending on the use are added together with the cyanine dye represented by the general formula 1. May be included. One of the fields in which the light absorbing material of the present invention can be advantageously used is the field of optical recording media. In such a field, the light absorbing material of the present invention is an organic perforated optical recording medium, especially As the light, use a laser beam with a wavelength of around 780 nm, usually a laser beam of 775 to 795 nm. It is suitable as a material for forming a recording layer in an optical recording medium such as a CD-R. When the light-absorbing material of the present invention is used for an optical recording medium, other dye compounds may be contained, if necessary, together with the cyanine dye represented by the general formula 1 without departing from the purpose of the present invention. Even if one or more materials commonly used in optical recording media such as light absorbing materials, lightfastness improvers, binders, dispersants, flame retardants, lubricants, antistatic agents, surfactants, plasticizers, etc. Good. As described above, many of the cyanine dyes according to the present invention have a high solubility in an organic solvent (the solubility at 20 ° C. in the FP is higher than 12 mg ZmI), and thus the cyanine dye contains such a cyanine dye. When the light absorbing material of the present invention is used for an optical recording medium such as a CD-R, the light absorbing material is dissolved in an organic solvent, and the efficiency of the operation of applying the solution to the substrate of the optical recording medium is increased, and the characteristics are improved. In addition, it is easy to manufacture an optical recording medium having excellent quality with a high yield.

Therefore, the use of the light absorbing material according to the present invention will be described using an optical recording medium as an example. The light absorbing material according to the present invention does not require any special treatment or operation when used in an optical recording medium. The optical recording medium according to the invention can be manufactured according to a known optical recording medium. For example, one or more of the cyanine dyes of the present invention may be used as a light absorbing material, and if necessary, one or more of the other light absorbing materials may be used to adjust the reflectance and light absorption of the recording layer. In addition, one or more of a lightfastness improver, a binder, a dispersant, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer, etc. are added, and the mixture is dissolved in an organic solvent. Apply evenly to one side of the substrate by spraying, dipping, roller coating, spin coating, etc., dry it to form a thin film of cysteine dye to be the recording layer, and then reflect it as necessary Gold, silver, copper, etc. by vacuum evaporation, chemical vapor deposition, sputtering, ion plating, etc., so that the rate is 65% or more, preferably 75% or more. , Platinum, Metals such as aluminum, cobalt, tin, nickel, iron, and chromium, or a general-purpose organic reflective layer material can be used to form a reflective layer that adheres to the recording layer, and to protect the recording layer from scratches, dust, dirt, etc. For protection, UV-curable resin or thermosetting resin containing flame retardant, stabilizer, antistatic agent, etc. is spin-coated and cured by irradiating with light or heating to secure the reflective layer. Form a layer.

Examples of the lightfastness improver include nitroso compounds such as nitrosodiphenylamine, nitrosoanilin, nitrosophenol, and nitrosonaphthol; tetrasoanoquinodimethane compounds, diimmonium salts, and bismuth salts.

[2'-Chloro-3-methoxy 4- (2-methoxetoxy) benzyl] Nikkel (trade name "NKX-1 199", manufactured by Hayashibara Biochemical Laboratory Co., Ltd.), Formazan Metals A metal complex such as a complex is used, and these may be used in an appropriate combination as needed. Desirable lightfastness improvers are those comprising a ditroso compound or a formazan metal complex. Particularly desirable are those described in Japanese Patent Application No. 11-188893 filed by the same applicant. Nitroso compounds having a phenylpyridylamine skeleton disclosed under the name “Phenylpyridylamine derivative”) or one or more of formazan compounds as ligands, for example, nickel, zinc, cobalt, iron, copper, palladium And the like. When used in combination with such a lightfastness improver, it does not reduce the solubility of the cyanine dye of the present invention in an organic solvent or substantially impairs the desired light characteristics without affecting the ambient light such as reading light or natural light. Undesirable changes such as deterioration, fading, discoloration and denaturation of the cyanine dye due to exposure can be effectively suppressed. The mixing ratio is usually such that the lightfastness improver is added in an amount of from 0.01 to 5 mol, preferably from 0.1 to 1 mol, per mol of the cyanine dye. Since the cyanine dye of the present invention exhibits practically no solubility in various organic solvents, there is no limitation on the organic solvent for applying the cyanine dye to the substrate. Therefore, in the production of the optical recording medium according to the present invention, for example, TFP frequently used for producing the optical recording medium, or hexane, cyclohexane, methylcyclohexane, dimethylcyclohexane, ethylcyclo, etc. Hexane, isopropylcyclohexane, tert-butylcyclohexane, octane, cyclooctane, benzene, toluene, xylene, and other hydrocarbons, carbon tetrachloride, black-mouthed lurum, ，, 2-dichloroethane, 1,2 —Dibromoethane, trichloroethylene, tetrachloroethylene, chlorobenzene, bromobenzene, α-halides such as chlorobenzene, methanol, ethanol, 2,2,2 triethanol, 1 —propanol , 2-propanol, 1-methoxy 2-propanol 1 1-ethoxy-2—propanol, 1-butanol, 1-methoxy 2—ptanol, 3—methoxy 1-butanol, 4-methoxy-1—butanol, isobutyl alcohol, ぺMethyl alcohol, isopentyl alcohol, cyclohexanol, 2-methoxyethanol (solvent with methyl acetate), 2-ethoxyethanol (solvent with ethyl acetate), 2-isopropoxy-11 monoethanol, diethylene glycol, Alcohols such as triethylene glycol, propylene glycol, glycerin, phenol, benzyl alcohol, cresol, diacetone alcohol and phenols, getyl ether, diisopropyl ether, tetrahydrofuran, tetrahydrofuran Dro Pyran, 1, 4 years old Kissan, Annisaw 1,2-Dimethoxetane, diethylene glycol dimethyl ether, cyclohexyl 18-crown-16, ethers such as methyl carbitol, ethyl carbitol, furfural, acetone, 1,3-diacetyl acetone, ethyl methyl ketone T Ketones such as chlorhexanone, esters such as ethyl acetate, butyl acetate, ethylene carbonate, propylene carbonate, trimethyl phosphate, formamide, N-methylformamide, N, N-dimethylform Amides, amides such as hexamethylphosphoric triamide, nitro compounds such as nitromethane and nitrobenzene, nitrotrils such as acetic nitrile and propionitrile, ethylenediamine, Select from general-purpose organic solvents other than TFP, including amines such as pyridine, piperidine, morpholine, and N-methyl butyl sulfide, and sulfur-containing compounds such as dimethyl sulfoxide and sulfolane. These are appropriately mixed and used.

In particular, the cyanine dye of the present invention has a high solubility in organic solvents that are easily evaporated, such as, for example, TFP-methylsesolve, ethylsesolve, diacetone alcohol, and the like. Even when dissolved and applied to a substrate, after drying, crystals of cyanine dye do not appear, and the thickness and surface of the recording layer do not become uneven. In addition, many of the cyanine dyes of the present invention have good solubility in non-halogen solvents, for example, alcohols such as methyl sorb and ethyl sorb, ketones such as diacetone alcohol and cyclohexanone. Demonstrate. When the cyanine dye of the present invention is applied to a substrate by dissolving it in such an alcohol, there is a practical advantage that the solvent is not likely to damage the substrate or pollute the environment.

The substrate may be a general-purpose substrate, and is usually formed by a compression molding method, an injection molding method, an extrusion injection molding method, a heat-curing polymer method (2P method), a heat-curing integral molding method, a light curing integral molding method, or the like. Depending on the end use, an appropriate material may be formed into a disk having a diameter of, for example, 12 cm and a thickness of 0.6 mm or 1.2 mm, and may be used as a single plate, or may be used as an adhesive sheet or an adhesive sheet. It is used by appropriately bonding with an adhesive or the like. The substrate material is substantially transparent and has a wavelength of 400 to 850 nm. In principle, any material can be used as long as it has a light transmittance of 80% or more, preferably 90% or more. Examples of the individual materials include, for example, glass and ceramic, as well as, for example, polymethyl methacrylate, polycarbonate, polystyrene (styrene copolymer), polymethylpentene, polyetherimide, polysulfone, and polysulfone. Ether sulfone, polyacrylate, polycarbonate, polystyrene alloy, polyester carbonate, polyphthalate carbonate, polycarbonate acrylate, amorphous polyolefin, methacrylate copolymer Plastics such as materials, diaryl carbonate, diethylene glycol and epoxy resin are used, and polycarbonate is usually frequently used. In the case of a plastic substrate, the synchronization signal and the recess indicating the address of the track and the sector are usually transferred to the inner circumference of the track at the time of molding. Although there is no particular limitation on the shape of the concave portion, the concave portion should have an average width in the range of 0.3 to 1.2 Atm and a depth of 70 to 200 nm. It is desirable to do. The light-absorbing material according to the present invention is formed into a solution having a concentration of 0.5 to 5% (wZw) in the organic solvent as described above while taking the viscosity into consideration, and the recording layer after drying has a thickness of 10 to 1,0. It is uniformly applied to the substrate so as to have a thickness of 100 nm, preferably 50 to 300 nm. Prior to the application of the solution, an undercoat layer may be provided on the substrate, if necessary, for the purpose of protecting the substrate, improving the adhesiveness, or the like. Examples include high molecular substances such as natural resin, polyamide resin, vinyl resin, natural resin, silicon, and liquid rubber. When a binder is used, cellulose esters such as nitrose cellulose, cellulose phosphate, cellulose sulfate, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose palmitate, and cellulose acetate propionate; methylcellulose Cells such as, cellulose, propylcellulose, and butylcellulose Rose ethers, polystyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, polyvinyl formal, polyvinyl alcohol, vinyl resins such as polyvinyl pyrrolidone, styrene-butadiene copolymer, styrene-acrylonitrile Tolyl copolymer, styrene-butadiene-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, copolymer resins such as maleic anhydride copolymer, polymethyl methacrylate, polymethyl acrylate, polyacrylite Acrylic resins such as polymethacrylate, polyacrylamide, polyacrylonitrile, polyesters such as polyethylene terephthalate, chlorinated polyethylene, polypropylene, etc. Polymers such as polyolefins are used alone or in combination at a weight ratio of 0.01 to 10 times the cyanine dye.

The method of using the optical recording medium according to the present invention will be described. The thus obtained optical recording medium such as CD-R is, for example, an AIG a InP system, a GaAs P system, a G A AIA s system, Oscillation by InGaP, InGaAsP or InGaAIP semiconductor laser, or YAG laser combined with second harmonic generation element (SHG element) By using a laser element having a wavelength of 7775 to 795 nm, various kinds of information can be written at a high density. For reading, a laser beam having a wavelength similar to that in writing or slightly larger than that, for example, a wavelength of 770 to 830 ηm is used. Regarding the laser output at the time of writing and reading, although it depends on the type and the amount of the light fastness improving material used in combination with the cyanine dye of the present invention, when writing information on the optical recording medium according to the present invention, It is desirable that the laser output is relatively high above the threshold of the energy at which the pits are formed, while the output when reading the written information is relatively low below the threshold. . Typically Can be written at a power of 1 mW or more, typically in the range of 3 to 3 OmW, and reading can be adjusted at a power of less than ImW, typically in the range of 0.1 to 0.5 mW. The recorded information is read by detecting a change in the amount of reflected light or the amount of transmitted light between the pit and the portion where the pit is not formed on the recording surface of the optical recording medium using an optical pickup.

The optical recording medium according to the present invention can record character information, image information, audio information, and other digital information at a high density, and thus a consumer and business recording medium for recording and managing these. Is extremely useful. Examples of the types of business and information that can be used with the optical recording medium according to the present invention include: construction '' construction in civil engineering and civil engineering drawings, maps, roads '' river ledgers, apachiua cards, building sketches, disaster prevention materials, Wiring diagrams, layout diagrams, newspapers, magazine information, regional information, construction reports, etc., including design drawings, composition tables, prescriptions, product specifications, product price lists, parts lists, maintenance information, and accidents in manufacturing Complaint processing casebooks, manufacturing process charts, technical documents, drawings, details, in-house work collections, technical reports, inspection reports, etc.Customer information in sales, customer information, company information, contracts, newspapers, magazine information, sales Reports, corporate credit surveys, inventory lists, etc., company information in finance, stock records, statistical materials, newspaper and magazine information, contracts, customer lists, etc. Seed application ・ Notification ・ Licensing ・ Licensing / permit documents, business report, etc.Real estate ・ Transportation property information, building plan, map, regional information, newspaper ・ magazine information, lease contract, company information, inventory list , Traffic information, supplier information, etc. Wiring in electricity and gas-plumbing diagrams, disaster prevention materials, work standard tables, survey materials, technical reports, etc. medical records, medical history, case files, medical relation diagrams, etc. Survey data, dissertations, etc. in information such as academic papers, academic journals, research monthly reports, research data, literature and literature indices at universities and research institutes, such as texts, problem collections, educational materials, and statistical materials at prep schools. Patent gazette, weather map, Data analysis records, customer files, legal precedents, membership lists of various organizations, past books, work records, competition records, tournament records, tourism information in tourism, traffic information, etc. , Newspapers, magazine information, person files, sports records, terrorist files, broadcast scripts, governmental maps, roads, river ledgers, fingerprint files, resident's cards, various applications, notifications, licenses, license documents, statistical documents, public documents And the like. In particular, the optical recording medium of the present invention, which can be written only once, must not be falsified or erased. For example, in addition to preservation of records such as medical records and official documents, it can be used in museums, libraries, museums and broadcasting stations. It is extremely useful as an electronic library.

Some of the special uses of the optical recording medium according to the present invention include compact disks, digital video disks, laser disks, MDs (information recording systems using magneto-optical disks), and CDVs (laser disks using compact disks). ), DAT (information recording system using magnetic tape), CD-ROM (read-only memory using compact disk), DVD-ROM (read-only memory using digital video disk), DVD-RAM (digital Writable read memory using video discs), editing, proofreading, digital photography, movies, video software, computer graphics, publications, broadcast programs, commercial messages, game software, etc. These include external programs for large computers and car navigation systems. It can be used as a recording means.

In the above, an example of application of the cyanine dye according to the present invention to an organic perforated optical recording medium using a laser beam having a wavelength of about 780 nm as a writing light as an application in the field of an optical recording medium. Has been mainly described. However, in the field of optical recording media, the use of cyanine dyes according to the present invention is not only for optical recording media such as CD-R, but also for DVD-R. In an optical recording medium, for example, by combining it with one or more other organic dye compounds that substantially absorb laser light having a wavelength of around 65 nm, the light absorption and light reflectance of the optical recording medium can be reduced. Adjustment and Z or correction, or transfer of the excitation energy by the laser light having a wavelength of about 65 nm to the cyanine dye of the present invention via the organic dye compound, thereby decomposing the cyanine dye of the present invention. A pit may be formed. More specifically, the optical recording medium according to the present invention refers to any recording medium utilizing the property that the cyanine dye of the present invention substantially absorbs visible light, and is not limited to an organic perforated type. In addition, for example, a heat-sensitive coloring method using a chemical reaction between a color former and a developer due to heat generated by light absorption of an organic dye compound, or a periodic uneven pattern provided on the surface of a substrate causes such heat generation. The so-called “moth-eye method” that uses the phenomenon of flattening may be used.

Furthermore, since the cyanine dye of the present invention has an absorption maximum in the visible region and substantially absorbs visible light, the light-absorbing material of the present invention can be used, for example, in addition to its use in optical recording media. It is extremely useful as a material for polymerizing a polymerizable compound by exposing it to visible light, a material for sensitizing a solar cell, and a material for dyeing various kinds of clothing. The light-absorbing material of the present invention may be used, if necessary, together with one or more other light-absorbing materials that absorb light in the ultraviolet, visible, and infrared or infrared regions. , E.g., drapes, laces, casements, prints, Venetian blinds, mouth screens, shutters, goodwill, blankets, futons, futon sideways, futon covers, futon cotton, sheets, Cushions, pillows, pillowcases, cushions, mats, carpets, sleeping bags, tents, car interior materials, built-in bedding products such as window glass, window glass, paper diapers, diaper covers, eyeglasses, Health goods such as monocles, hornets, insoles, shoes Filters, panels for information display devices such as CRT display, liquid crystal display, electroluminescent display, plasma display, etc., lining, wrapping, furoshiki, umbrella, umbrellas, stuffed animals and lighting equipment Screens, sunglasses, sunroofs, sun visors, PET bottles, storages, greenhouses, cold gauze, optical fibers, prepaid cards, microwave ovens, oven windows, and more. When used in packaging, filling or containers for packaging, filling or storing, it is not only possible to prevent or reduce obstacles and inconveniences caused by environmental light such as natural light and artificial light in living things and goods, Adjust the color, color tone, and texture of the item, and reflect or transmit from the item There are practical benefits that can adjust to a desired color balance.

Hereinafter, embodiments of the present invention will be described based on examples. Example 1 Cyanine dye

Take 40 ml of denatured alcohol in the reaction vessel, and add the compound represented by the chemical formula 13 (1-ethyl-3,3-dimethyl-2— [4- (N-phenylacetamide) -11,3— Butagenyl] 13H-benzo [e] indrendium = hexaflurophosphophosphate) 10.Og and the compound represented by the chemical formula 14 (1 butyl-2,3,3—tri) Methyl-3H—benzo [e] indrenium = p—toluenesulfonate) After adding 10.2 g of each, the mixture was heated to 55 ° C and stirred while triethylamine was added. After 6 ml was added dropwise over 10 minutes, the mixture was reacted at the same temperature for 30 minutes with stirring. Then, the reaction mixture was cooled with ice water, and the precipitated crude crystals were collected by filtration, washed with denatured alcohol, and dissolved by heating in an appropriate amount of an acetone / methanol mixture (volume ratio 2: 1). After filtering, concentrating, cooling and filtering again, the yellow-green color of the cyanine dye of the present invention represented by Chemical Formula 7 5.4 g of crystals were obtained.

Chemical formula 14:

A part of this crystal was taken and its melting point was measured. As a result, it was found to be 244 to 246 ° C. In addition, when the 'H-nuclear magnetic resonance spectrum was measured in a double-mouthed form according to the usual method, the chemical shift <5 (ppm, TMS) was 1.01 (3H, t, J = 7. _{5 H z, CH 3 -)} , 1 - 4 4 to 1 · 5 3 (5 H, m, CH 3 CH 2 -..), 1 8 3 (2 H, qw, J = 7 5 H z, _ _{CH 2 -), 2. 0 2} (6 H, s, CH 3 -.), 2 0 3 (6 H, s, CH 3 -..), 4 0 9 (2 H, t, J = 7 5 H z, one CH ₂ —), 4.17 (2 H, q, J = 7.5 H z, — CH _2- ), 6.14 (1 H, d, J = 14.1 H z, one CH =), 6.18 (1H, d, J = 14.4 lHz, one CH =), 6.63 (1H, t, J = 12.6 Hz, One CH =), 7.3 2 (1H, d, J = 8.lHz, ArH), 7.34 (1H, d, J = 8.1Hz, ArH) , 7.45 (2H, t, J = 7.5Hz> ArH), 7.60 (2H, t, J = 7.2Hz, ArH), 7.9 1 (4 H, d, J = 7.8 Hz, ArH) and peaks were observed at 8.11 to 8.19 (4H, m, AH and —CH =), respectively. Example 2 Cyanine dye

Instead of the compounds represented by the chemical formulas 13 and 14, each of the compounds represented by the chemical formulas 15 (1—butyl-3,3—dimethyl_2- [4-1 (N—phenylacetate) Amide) — 1,3-butadienyl] — 3H—benzo [e] indrhenium = hexafluorophosphoate) 10.0 g and the compound represented by the chemical formula 16 1,2,3,3—tetramethyl—3H—benzo [e] indrhenium = p—toluenesulfonate) 8.78 g, except that 6.2 g of green crystals of the cyanine dye represented by Chemical Formula 2 were obtained. Chemical Formula 15:

Chemical formula 16:

A part of this crystal was taken and its melting point was measured. Met.

Although the preparation conditions and yields of the cyanine dye of the present invention are slightly different depending on the structure, all of the cyanine dyes, including those represented by Chemical Formulas 1 to 12, are described in Example 1 or Example 2. , Or according to those methods. Example 3 Light absorption characteristics of cyanine dye

The visible absorption spectra of the cyanine dye of the present invention shown in Table 1 in a methanol solution state and in a film formation state on a glass plate were measured in accordance with a conventional method. Table 1 shows the results. FIG. 1 shows the visible absorption spectrum of the cyanine dye of the present invention represented by Chemical Formula 2 in a solution state and a thin film state.

Table 1: Cyanine dye absorption maximum (n_m)

Solution thin film

Formula 2 677 721

Chemical formula 7 678 722

Chemical formula 9 673 712

Chemical formula 10 678 718

Chemical formula 1 1 678 718

Chemical Formula 12 678 719 As can be seen from the results in Table 1, all of the cyanine dyes of the present invention that were subjected to the tests had a wavelength of 670 to 680 nm in a solution state, and a wavelength of 700 nm in a thin film state. The absorption maximum was shown at 10 to 70 nm. In particular, as seen in FIG. 1, in the thin film state, the absorption edge on the longer wavelength side extended beyond the wavelength of 800 nm, which means that the cyanine dye of the present invention has a longer absorption maximum on the longer wavelength side. This indicates that laser light having a wavelength of about 780 nm is substantially absorbed. Example 4 Solubility of cyanine dye

To 3 mI of TFP kept at 20 ° C, 3 hours while intermittently adding any of the cyanine dyes of the present invention shown in Table 2 so that undissolved cyanine dyes are constantly present. Stirred. Next, while maintaining the same temperature, the solution was filtered to remove the undissolved cyanine dye, and the saturation concentration of the cyanine dye in TFP1m1 was determined by a conventional colorimetric method. At the same time, the saturation concentration of known analogous compounds represented by Chemical Formulas 17 to 20 was measured in the same manner as a control. Table 2 shows the results. Chemical formula 17:

Chemical formula 18:

Chemical formula 19:

Formula 20:

Table 2

Cyanine dye Saturation concentration (mg / ml) Remarks

Chemical formula 2 65.7

Chemical formula 6 84. 1 The present invention

Chemical formula 7 63.8 The present invention

Chemical formula 9 36.9 The present invention

Chemical formula 10 47.3 The present invention

Chemical formula 1 1 49.8 The present invention

Chemical formula 1 2 47.4 The present invention

Chemical formula 1 7 11.7 Reference

Chemical formula 1 8 11.1 Reference

Chemical formula 19.5

Chemical Formula 20 10.7 Reference As can be seen from the results in Table 2, the control pentamethine cyanine dyes had a solubility (saturated concentration) of less than 12 mg ZmI, whereas The solubility of the cyanine dye of the present invention was significantly higher than that. In addition, the cyanine dye represented by the chemical formula 9, which had the lowest solubility among those subjected to the measurement, showed a solubility that reached 36.9 mg ZmI, which was more than three times that of the control cyanine dye. TFP is a typical organic solvent widely used for producing optical recording media. The cyanine dye of the present invention shows extremely high solubility in TFP, and in the state of a thin film formed on a glass plate, shows an absorption maximum in the visible region around a wavelength of 720 nm, and the absorption edge on the long wavelength side shows The extension beyond the wavelength of 800 nm indicates that the cyanine dye of the present invention is extremely useful as a light absorbing material constituting a recording layer of an optical recording medium such as a CD_R. I have.

Example 5 Optical recording medium

A cyanine dye of the present invention represented by either Chemical Formula 9 or Chemical Formula 10 as a light absorbing material is added to TFP to a concentration of 2% (w / w), and a lightfastness improving agent is added. Then, a known nitroso compound represented by the chemical formula 21 was added to a concentration of 0.4% (w / w), and then dissolved by applying ultrasonic waves. This solution was applied to a polycarbonate disk-shaped substrate (diameter 12 cm, thickness: 12 mm), onto which the synchronizing signal and the recess indicating the address of the track and sector 1 were transferred to the inner circumference of the track according to a conventional method. (1.2 mm) was spin-coated uniformly on one side and dried to form a recording layer having a thickness of 400 nm. Then, silver is vacuum-deposited on the substrate to form a 100-nm-thick reflective layer that is in close contact with the recording layer, and the reflective layer is coated with a known UV-curable resin (trade name “Dicurelia SD”). 1700 ”(manufactured by Dainippon Ink and Chemicals, Inc.) was evenly spin-coated, and then irradiated with light to form a protective layer in close contact with the reflective layer, thereby producing two types of optical recording media. Chemical formula 21:

Then, using an optical pickup with an oscillation wavelength of 780 nm and a writing output of 1 OmW, the 3T signal and 1T were applied to the optical recording medium of this example at a linear velocity of 4.8 mZ seconds (quadruple speed) according to a conventional method. After writing the 1 T signal (T = 4.32 18 MHz) respectively, reflectivity, modulation, 3 T jitter and symmetry (3 T signal and 11 T at average read output) Signal deviation) was tested. Table 3 shows the results.

Table 3: Cyanine dye Reflectivity (%) Modulation degree (%) 3T jitter (nanosecond) Symmetry

11T 3T Pit forming area Non-bit forming city (%)

Chemical formula 9 66 84 42 16 25-4

Chemical formula 10 67 85 45 26 32 -4 As can be seen from the results in Table 3, the optical recording medium of this example met the standards required for CD-R in all the items tested. Each of the optical recording media of this example has a recording capacity exceeding 600 MB, and a large amount of document information, image information, and the like can be obtained by using an optical pickup using a laser element having an oscillation wavelength of around 780 nm. Audio information and other digital information can be written at high density. When the recording surface on which information was written using a semiconductor laser with an oscillation wavelength of 780 nm was observed with an electron microscope, no crystallization of cyanine dye was observed at all, and a fine pit of about 1 m was observed. It was formed regularly and densely. Industrial applicability

As described above, the present invention is based on the creation of a novel indrenine-based pentamethine cyanine dye and the discovery of its industrially useful properties. Since the cyanine dye of the present invention has an absorption maximum in the visible region, it requires an organic compound that absorbs visible light. For example, various fields including optical recording media, photochemical polymerization, solar cells, and dyeing It has a wide variety of uses. In particular, the cyanine dye of the present invention, which substantially absorbs laser light having a wavelength of around 780 nm in a thin film state, is extremely useful as a light absorbing material constituting a recording layer of an optical recording medium such as CD-R. is there.

Furthermore, since many of the cyanine dyes of the present invention have high solubility in organic solvents such as TFP, light absorbing materials containing such cyanine dyes are used in the production of optical recording media. It improves the efficiency of the work of dissolving in a solvent and applying the solution to the substrate of the optical recording medium, and facilitates the production of an optical recording medium with good characteristics and quality with good yield. In addition, since the cyanine dye of the present invention has a counterion of a fluorine-containing anion such as hexafluorophosphate ion, it is different from known analogous compounds having a perchlorate ion as a counterion. Easy to handle, even if silver is used for the reflective layer of the optical recording medium, the reflective layer is hardly damaged.

Such useful cyanine dyes include 2,3,3-dimethyl-2_ (1,3-butagenyl) -13H-benzoin-drenium skeleton, and 2,3,3-trimethyl-3H-benzozoin-drenium. A desired amount can be produced by a method that involves a step of reacting a compound having a skeleton.

It can be said that this invention having such remarkable effects is a significant invention that greatly contributes to the art.

Claims

The scope of the claims

1. Cyanine dye represented by general formula 1

General formula 1:

In the general formula 1, R, represents a methyl group or an ethyl group. R ₂ represents a linear or branched alkyl group different from R 1. R ₃ represents a hydrogen atom or a substituent selected from an octogen group and a lower alkyl group. X— represents an anion containing fluorine and a metal element of Group 15 in the periodic table.

2. The cyanine dye according to claim 1, wherein X— is a hexafluorinated acid ion or a hexafluorinated antimonate ion.

3. The cyanine dye according to claim 1 or 2, which substantially absorbs visible light having a wavelength of around 780 nm.

4. 2,2,3,3—Tetrafluroyl 1 A cyanine according to claim 1, 2 or 3 having a solubility in monopropanol at 20 ° C of more than 12 mg ZmI. Pigment.

5. A light absorbing material comprising the cyanine dye according to any one of claims 1 to 4.

6. The light-absorbing material according to claim 5, which has sensitivity to one laser beam having a wavelength of about 780 nm in a thin film state.

7. The cyanine dye according to any one of claims 1 to 4, An optical recording medium comprising.

8. The optical recording medium according to claim 7, wherein the recording layer contains the cyanine dye according to any one of claims 1 to 4 and an appropriate light resistance improving agent.

9. The optical recording medium according to claim 7 or 8, wherein a laser beam having a wavelength of about 780 nm is used as the writing light.

1 0 -. R corresponding to general formula 1, and represented by the formula of compound 2 with R _3, is reacted with the compound represented by Formula 3 with R ₂ corresponding to the general formula 1 The method for producing a cyanine dye according to any one of claims 1 to 4, wherein the method comprises passing through a step. General formula 2:

General formula 3:

—In the general formulas 2 and 3, X, — and X represent an appropriate counter ion, and L represents an appropriate leaving group.

1 1. — The compound represented by the general formula 4 having R, corresponding to the general formula 1 is different from the compound represented by the general formula 5 having R ₂ and R ₃ corresponding to the general formula 1. The method for producing a cyanine dye according to any one of claims 1 to 4, wherein the method comprises a step of reacting the cyanine dye.

-General formula 4:

-General formula 5: